Initial community commit

Src/external_dependencies/openmpt-trunk/include/premake/website/docs/io.readfile.md

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+read a file's contents as a string.
+
+```lua
+io.readfile(filename)
+```
+
+get the individual file lines using [[string.explode|string.explode]].
+
+### Parameters ###
+
+* `filename` - a path to a filename.
+
+### Availability ###
+
+Premake 5.0.0 alpha 12 or later.
+